Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 818 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.304 decreased by 25% =
2. 2.60 decreased by 35% =
3. 3.420 increased by 30% =
4. 4.400 decreased by 8% =
5. 5.200 increased by 8% =
6. 6.500 increased by 12% =
7. 7.40 decreased by 5% =
8. 8.320 increased by 10% =
9. 9.644 increased by 25% =
10. 10.75 increased by 12% =
11. 11.124 decreased by 25% =
12. 12.510 decreased by 30% =
13. 13.260 decreased by 5% =
14. 14.412 increased by 75% =
15. 15.700 decreased by 15% =
16. 16.536 increased by 75% =
17. 17.325 decreased by 8% =
18. 18.320 increased by 5% =
19. 19.590 increased by 50% =
20. 20.44 increased by 75% =
21. 21.775 decreased by 8% =
22. 22.335 increased by 40% =
23. 23.50 increased by 8% =
24. 24.660 decreased by 10% =
25. 25.300 decreased by 10% =
26. 26.584 increased by 75% =
27. 27.405 decreased by 60% =
28. 28.670 increased by 40% =
29. 29.560 increased by 5% =
30. 30.385 decreased by 60% =
31. 31.576 increased by 25% =
32. 32.160 increased by 30% =
33. 33.108 increased by 25% =
34. 34.600 decreased by 15% =
35. 35.460 increased by 5% =
36. 36.332 decreased by 75% =
37. 37.784 decreased by 25% =
38. 38.800 decreased by 50% =
39. 39.245 increased by 60% =
40. 40.800 decreased by 5% =

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